We have a rear radiator. And a big flap. Dust rocks etc come from under the flap and hit the rock guard. Some dust hts the windshield ad over the top of the Edge.
our Saturn, former toad it hit the rock guard but all over the windshield and a good bit on the hood. It tumbled over the top of it at speed. And oil spray, and grease from being thrown from drive shaft u joints onto muffler. Fixed, that where we stored it greased it and wiped all excess off. They won't do that a truck lube.Stuff from under the coach and through rear radiator if you have one tumbles over the top edge of the rock guard but it protects the front end of the Edge very well. The guard that stretches flat in front from the tow bar to front of car would stop a lot of rocks and dust etc too. Just look at one on some body's ig to see how much stuff is on it. Air going under and around the Mh will go all the way to the top of or mh in the rear and it tumbles from under and around it too. I've seen some who looked cleaner and they were probably side radiators. Those aero tabs might help but then maybe not. Thought about extending the hitch to get the toad further back from the coach, but not sure that is a such a good idea. It depends on the coach and the toad as to what works best. We get some protection to toad so we won't tow without it.